What does "prejudicial" mean?

Prejudicial: Tending to obstruct or impair; hurtful; injurious; disadvantageous; detrimental. Hooker. His going away . . . was most prejudicial and most ruinous to the king's affairs. Clarendon. -- Prej`u*di"cial*ly, adv. -- Prej`u*di"cial*ness, n.

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